Monday, November 5, 2007
65-3

Effect of Seed Treatment in a No-Tillage Soybean Production System in Iowa.

Joseph Osenga and Palle Pedersen. Iowa State University, 2636 Kent Ave. Apt. 101, Ames, IA 50010

The adoption of no-tillage production systems have been slow in Iowa compared to other U.S. states. This is primarily due to grower concerns with cool, wet soils that are enhanced in no-tillage systems relative to conventional tillage systems. These conditions slow early soybean growth and favor damping-off caused by certain soilborne pathogens that may be problematic on Iowa’s many poorly drained fields. The use of seed treatments may be a practice that could be implemented to overcome these issues. Our objective is to evaluate the use of seed treatments in a no-tillage production system in Iowa on soybean stand and yield. Field experiments were conducted at five different locations in Iowa including both well and poorly drained soil types. The experimental design was a randomized complete block in a split-plot arrangement with four replications. The main plot was tillage system while the sub-plot was the combinations of three varieties and five treatments. Treatments included a control, two fungicide seed treatments (metalaxyl + trifloxystrobin and mefanoxam + fludioxonil), and two combination fungicide/insecticide seed treatments (mefanoxam + fludioxonil + thiamethoxam and metalaxyl + trifloxystrobin + imidacloprid). The three varieties used were Asgrow AG2802, Pioneer P92M54, and Stine 2932-4. Agronomic data taken included grain yield, early and harvest plant stands, grain moisture, plant height, lodging, and seed size. Data from the 2007 growing season will be presented in the poster.

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